Post by Chrysi Cat Post by J. Clarke
But a mere 5 years ago SN 2014J blew crap out of any planets it might
Well, yes, but bear in mind that modern theory is that stars can't even
reach 'normal' nova, let alone supernova, unless another star intrudes
on their heliosphere, and Sol doesn't seem to be in for that problem at
least until Andromeda crosses the Milky Way's path.
Stars _of our Sun's size or less_ aren't going to go nova normally, and can't
go supernova, wthout violent extrasolar events intruding, correct. But two
starts colliding is NOT what makes a nova. (Have you gotten this confused with
"small star orbits big star, big star's hydrogen gets drawn to small star,
periodically overheating it in a small nova"?)
Novas can have several causes, most having to do with a violent event, or
moderately violent periodic event even, inside the star. Supernovas are
usually from a large star that's gotten concentric shells of "burning hydrogen"
"burning helium" "burning carbon" etc. established in itself, until they get
to the one whose burning-ash is iron, in the middle. Iron won't burn further,
being at the bottom of the curve of binding energy, so accumulates; one of
several mechanisms depending on star size can cause the iron core to collapse,
or else the layers immediately around it to collapse onto the core, followed
RIGHT AWAY by explosive runaway fusion of the fuel left in the collapsed layers
and a subsequent megaboom. [They CAN also happen from a white dwarf
accumulating material from a companion star, enough to trigger runaway carbon
fusion, effectively making the WHOLE white dwarf go megaboom.]
Two (or more) stars colliding is rare enough that it's down in the statistical
clutter around zero, when enumerating star-go-boom causes.
Dave, after all, there's a REASON "Doc" Smith had the Eddorians travelling so
long; in his multiverse, the "cigar-shaped length of material drawn out by a
passing wandering star" mechanism for making planets WAS how they formed, so
planetary systems were extraordinarily rare
\/David DeLaney posting thru EarthLink - "It's not the pot that grows the flower
It's not the clock that slows the hour The definition's plain for anyone to see
Love is all it takes to make a family" - R&P. VISUALIZE HAPPYNET VRbeable<BLINK>
my gatekeeper archives are no longer accessible :( / I WUV you in all CAPS! --K.